Now allow me to speak up for my favorite form of pun: the Tom Swifty. They always feature Tom (a science fictional young hero from the 1920s), with him making a statement followed by an adverb that puns on the content of the dialogue.

As in, “Someone forgot to pay the light bill,” Tom said darkly. Or “I’ve overslept,” Tom said belatedly.

My favorite own coinage: “I’m going over Niagara Falls,” Tom said incandescently. Which someone topped with, “My ancestors used to rule Peru,” and so on.

Mr. Scalzi, I’d like your permission to repost this blog entry (cut-and-pasted, in full, with full attribution, and a link to this page,) to a Spider Robinson-inspired Facebook group of which I am one of the admins, called “Friends of Mike Callahan.”
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“The fun of the pun is in the tone of the groan!” — some wiseacre